Slotting-machine.



.No. 384,486. I

PATENTED APR.`1.4, 1908. D. c. GRIGGS & R. H. SMITH.

` SLOTTING MACHINE. APPLIUAHOI; FILED JULY 25. 1906.

5 SHEETS-SHEET 1.

Wil/um PATBNTED APR. 14 D. C. GRIGGS & R. H. SMITH.

sLoTTING MACHINE. APPLICATION :FILED .IIILY Z5, 1906.

5 SHEETS-SHEET 2.

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ms NcRRIs PETER: co., wAsmNm'aN, u. c.

BATENTBD APR. 14, 1908. D. C. GRIGGS & R. E. SMITH.

sLoTTING MACHINE.

APPLICATION FILED JULY 25, 1906.

5 SHEETS-SHEET 3.

1n: Hemus PETERS co.. wnsmucwn. n. c

No. 884,486. y PATBNTBD APR. I4, 1908. D. C. G-RIGGS & R. H. SMITH.

sLoTTING MACHINE. APPLICATION FILED JULY 25, 1906.

rus lvmmls rzrsns cn., wAsmNcroN, n. c.

No. 884,488. .Y PATENTED .4818. 14, 1908.`

D. 8. 8818888 R. H. SMITH. I

SLOTTING MACHINE. APPLIOATIQN FILED JULY 85, 1908.

' 5 SHEETS-SHEET s.

THE Nonni: Fzrsns co., wAsmNcTaN. n. c,

UNITED STATES PATENT OFFICE.

DAVID C. GRIGGS AND ROY H SMITH, OF WATERBURY, CONNECTICUT, ASSIGNORS TOTHE WATERBURY FARREL FOUNDRY AND MACHINE COMPANY, OF WATERBURY,CONNECTI- CUT, A CORPORATION OF CONNECTICUT.

SLOTTING-MACHINE T o all whom it may concern:

Be it kno'wn that we, DAVID C. GRIGGS and ROY H. SMITH, citizens of theUnited States, residing at I/Vaterbury, in the county of New Havenv andState of Connecticut, have invented certain new and useful Improvementsin Slotting-Machines, of which the following is a specification,reference being had therein to the accompanying drawings.

Our invention relates to new and useful improvements in slottingmachines, and refers more particularly to that type of machine used forslotting screw blanks.

It is the object of our invention, among other things, toproduce amachine of this character which will be automatic in its severaloperations have means for rigidly holding the blank during the slottingoperation; means for ointing the blank, preferably during the s ottingoperation, means for adjusting the saw mechanism so as to vary the depthof the slot and the movement of the saw means for removing the bur fromthe 'head after the slotting operation; ejector mechanism; and toaccomplish these results by parts that can be economically constructedand readily assembled.

To these, and other ends, our invention consists in the slottingmachine, having certain details of construction and combinations ofparts as will be hereinafter described and more particularly pointed outin the claims.

Referring to the drawings, in which like numerals of reference designatelike parts in the several figures Figure 1 is a front view of myimproved slotting machine Fig. 2 is a side elevation thereof lookingfrom the right of Fig. 1 Fig. 3 is a side elevation looking toward theleft of Fig. 1, Fig. 4 is a rear elevation with the hopper mechanismremoved; Fig. 5 is a plan view of a portion of the mechanism, Fig. 6 isa front elevation of the blank holding mechanism, the bur trimmingdevice and adjacent parts; Fig. 7 is a side elevation of the ejectormechanism Fig. S is an enlarged view of the holding mechanism andejector plate Fig. 9 is a plan view, partially in section, of the slidehead; Figs. 10 and 11 are a front elevation and plan view, respectively,of the slide connection, Fig. 12 is an elevation of the trimming cutterhead; Fig. 13 is a detail plan view of the saw hood, Fig. 14 is a sideelevation thereof Fig. 15 isa Patented April 14, 1908.

Serial No. 327,698.

cent parts, more es ecially illustrating the position of the hea gage;and Fig. 17 is a fragmentary view of one of the uprights forming part ofthe frame 3 Fig. 1S is a sectional plan view of some of the mechanismfor im arting a lateral adjustment to the saw, ta en upon line A-B ofFig. 1.

In the practice of my invention I provide a bed 1 which is mounted uponsuitable legs 2 and to which is secured a frame 3 within which isjournaled a hollow shaft 4, and a driving shaft 5 having a pulley 6 andpinions 7 and 8 thereon. Upon a stud 9 fixed to the frame 3 is a gear 10which meshes into the pinion 7 and has a pinion 11 Xed to the hubthereof. Adjacent to the stud 9 is a stud 12 having a gear 13 rotatablethereon which meshes into and is driven by the pinion 11 and having apinion 14 upon its hub which meshes into and drives a gear 15 xed on theshaft 4. The rotary movement of the shaft 5 is transmitted to the hollowshaft 4 through the pinion 7, gear 10, pinion 11 gear 13, pinion 14 andgear 15, all of said gears and pinions having such relative diameters aswill impart the proper relative speed of rotation of the hollow shaftwith that of the driving shaft. The sizes of these gears may be changedto provide a variable speed of rotation, and to insure the properintermeshing of i the teeth of these gears, the stud 12 is shiftablymounted in a slot 109 in the frame 3.

The numeral 16 designates the blank holding block which is adjustablysecured to the frame 3 by the screw 17 and held against movement in itsadjusted positions by the screw 18 threaded through the integral lug 19. Reciprocally mounted in the head 21 is a slide 22 having at its frontend an angular face 23 opposite to an angular face 20 on the block 16.In said slide, adjacent to the angular face 23 is a depression ofsubstantially the same depth as the diameter of the blank, and having awall 24 adjacent thereto. Motion is imparted to this slide from a cam 25fixed on the shaft 4 through a Swingin lever 26 mounted on a stud 27 inthe brac ret 2S which is secured at both ends to the frame 3; a roll 29rotatably. connected with said lever and operative within a groove insaid cam 5 a rock sleeve 31 mounted in the head 21 upon an eccentricshaft 32; a connection 30` joining the lever 26 with said rock sleeve;and a link 33 connecting said slide and said rock sleeve 31. Theeccentric shaft 32 is locked in its adjusted positions by the blocks 34and 35 which lie within the head 21 and are connected by the bolt 36, Byunloosening the bolt 36 the friction of the blocks 34 and 35 upon theshaft 32 Vis removed and the shaft may be rotated as desired, it isagain locked by tightening the bolt 36 which draws the blocks 34 and 35together and against the shaft 32 with sufficient friction to preventits rotation.

The blanks to be operated upon are dropped into a hopper 37 which ismounted upon a standard 38 fixed to the bed 1. Rotatably mounted withinsaid hopper is a shaft 39 having a pulley 40 thereon which is driven byabelt 41 connecting the pulley 42 on the shaft 4. A spider arm 43 isfixed on said shaft and during its rotation passes through and agitatesthe mass of. blanks in said hopper, lifting some of them into line witha chute which is composed of parallel side plates 44, a bracket 106, atop guide plate 45, which is secured so as toleave an open space betweenthe top of said side plates and the underside of said guide plate, whichwill be substantially the same as the thickness of thel head of theblank, and a bracket 107. The hopper mechanism herein shown is only oneof the many forms that can be used, and applicants do not claim saidhopper as a part, of this invention. Said guide plate 45 is curved atits lower end so that the blanks as they slide by gravity down throughthe chute from the hopper are turned from a vertical to a horizontalposition and the opening in the bottom end of said chute is directlyabove the depression in the slide 22 when the same is in its retractedposition (see Fig. 6).

To insure the position of the blanks on the slide 22 we have provided aguide plate 108 which is fixed to'the bracket 107 (see Fig. 9) and liessubstantially parallel to the direction of movement of said slide. It isdesigned that the blanks should drop into the depression in the slide 22with the underside of the head against the side of the said slide, butif perchance this should not occur the relative position of the guideplate 108 is such that during the forward movement of the slide the headof the blank engages said plate and by such engagement the blank ismoved on said slide so that before the stroke of said slide is completedthe head of the blank will be brought up against the side of the slide,thus presenting all of the blanks to the saw mechanism in the samerelative position therewith.

In operation the blanks drop from the chute into the depression in thetop of slide 22 and the slide then moves forward until the blank, whichlies against the wall 24, engages the angular face 20 of the block 16where it is held rigidly and against movement, the blank being pinchedsufficiently to prevent its rotation. The amount of pressure applied tohold the blank is varied by shifting the slide through the adjustment ofthe eccentric shaft 32 and by shifting the relative position of theblock 16 on .the frame 3. This adjustment also provides means wherebythe blank will be presented in line with the trimming mechanism hereiinafter described.

in order that there may be no damage to any of the parts if perchance ablank should become clogged, either in the chute or in the slide, or anyof the adjacent mechanism, we have provided means for joining theconnection 30 `with the rock sleeve 31 so that some of the parts willyield if any strain above that of the normal strain is applied. Thismeans comprises a stud 65 fixed in an arm ofthe rock sleeve 31 andpasses through a slot 66 in the connection 30; a rod 67 movablyconnected with said connection rod and parallel therewith, one end ofwhich abuts against an arm of the sleeve 31; and springs 68 secured atone end tosaid rod and at the other end to said connection, the saidsprings being of suiiicient tension to actuate the sleeve 31 and theslide 22 when the parts operate normally and the blanks pass through theoperation successfully, but the tension is not sufiicient to actuate anyof the parts if perchance the blank should become clogged or any of themechanism broken.

The saw frame 46 is mounted and swings' upon a block 47; parted to thisframe through a rock shaft 49 journaled in the bracket 28 having an arm50 integral therewith carrying a roll 51 which lies against theperiphery of a cam 52 fixed on the shaft 4; a crank arm 53 preferablyformed integral with said rock shaft; a bolt 54 adjustably mountedwithin said crank arm; a threaded connection 55 rotatably mounted onsaid bolt 5 a similarly threaded connection 56 pivotally connected by astud 57 to the saw frame 48; and a nut 58 threadably connected to bothof said connections. The cam 52 is so shaped that no movement is givento the rock shaft 49 except when it is necessary to impart-a swingingmovement to the saw and the roll 51 is held in permanent contact withsaid c-am by a spring 59. Journaled within said frame and the adjustablebearing 60 is the saw arbor 61 that is rotated through a gear 64 whichmeshes into the pinion 8, and having a saw 62 mounted thereon, endwisemovement of which is prevented by the jam nuts 63. The cam 52 is sotimed that as soon as the blank is held rigid between the block 16 andslide 22 the saw 62 will engage the head of said blank and cut the slottherein.

The amount of swing imparted to the saw frame is determined by theadjustment of A swinging motion is imthe bolt 54 within the crank arm53, which adjustment provides means whereby the depth of the slot may bevaried. This adjustment is also used to bring the saw into contact withthe head as soon as the blank is secured, so that no time may be lostwhether the head is a thin one with a small slot or a thick head with adeep slot. By properly regulating the adjustment, and using it inconnection with the change gears, thus varying the number of cycles Derminute of the machine, the output will vary with different classes ofwork. The saw is moved laterally, to bring it into alinement with thecenter of the blank, by the lateral adjustment of the block 47 in theframe 3 which is accomplished by rotation of the set screws 103 whichare threaded through the fixed posts 104 and impinge against the lug 105on the block 47. During the period of adjustment the screws 48, whichpass through slots 110 in the block 47 and are threaded into the frame3, are loosened to allow block 47 to shift.

The saw sometimes, and more especially when it becomes dull, leaves abur at the end of the slot cut in the blank, which bur has usually beenremoved by either placing the blanks into a tumbling barrel and the burknocked oif by the engagement of one blank with another during thetumbling process, or else they have been removed manually. In some caseseven the bur has not been removed but the screw used with a bur upon thehead, which is unsightly in appearance and always damages and tears sucharticles as are brought in contact therewith. We have provided means forautomatically removing this bur before the blank leaves the machine,which means comprises a reciprocating slide 75 mounted within the frame3 and held against lateral movement by the caps 76; a knife 77 connectedwith the forward end of this slide a rock lever 78 having engagementwith said slide and pivotally connected to a fixed part 79 on the frame3 a friction roll 80 in said lever which lies against the edge of thecam 25 (see Fig. 5); and a spring 81 which moves the slide in onedirection, said spring being connected at one end to said slide and atthe other end to the frame 3.

The position of the depression 82 in the side of the cam 25 is timed sothat immediately after the saw leaves the head of the blank the roll 80will be in register with said depression and the spring 81 Will drivethe slide 75 forward, at which time the knife 77 which moves in a pathat substantially a right angle to the slot in the blank head will engagesaid bur and knock it off. The slide is then withdrawn by the roll 80passing out of said depression.

The mechanism for pointing the ends of the blanks comprises a shaft 83which is journaled within the hollow shaft 4 and is rotated by the gear10 which meshes into and drives a pinion 84 on said shaft 83 a shaft 85journaled in the standard 86; a beveled gear 87 fixed on the end ofshaft 83 meshing into and driving a pinion 88 on shaft 85; a rock lever89 fixed on a shaft 92 which is rotatable in an arm 93 integral with thestandard 86 and carrying a roll 90 which lies against the face of a cam91 Xed on the shaft 4; a yoke arm 94 journaled on the shaft 92 andcarrying friction blocks 95 which lie within a recess in the block 96`fixed to the shaft 85, said yoke arm 94 is adjustably connected with anarm 97, integral with the shaft 92, by the bolt 98 which passes througha slot 99,v and a set screw 100 threaded through said arm 97 andimpinging` against the yoke arm 94. The adjustable connection betweenthe yoke arm 94 and the arm 97 permits of an endwise adjustment of theshaft 85. Fixed to the foward end of the shaft 85 is a chuck 101carrying a knife 102. The particular type of this chuck is not materialto my invention, as any one of the numberless chucks used for thispurpose is adaptable to my device, it being simply necesary to insert acutting knife that will produce the desired result. While the blank isbeing held between the block 16 and slide 22 the shaft 85 is moved inthe direction of its length toward said blank and the chuck engages andcuts the end of the blank which projects to the rear of said block atthe same time that the head of the blank is being slotted. The ends ofthe blanks may be thus squared, rounded or pointed.

The ejector mechanism comprises a plate 69 secured to a rock lever 70that is pivotally connected with the frame 3 by a stud 71 and having afriction block 72 thereon which lies against the periphery of a cam 73fixed on the shaft 4. This mechanism is timed so that immediately afterthe blank is held between the block and slide the late 69 movesdownwardly and enters the s ot 74 in the top of the slide 22, the bottomof said slot being on substantially the same horizontal plane as thebottom surface of the depression in the slide 22. Said plate is held inthis position during all of the return movement of the slide and theblank is thereby pushed off as the slide is retracted and drops throughan aperture in the bed of the machine into a receptacle convenientlylocated to receive it. This ejector plate is again raised as the slidebegins to move forward, but only a sufficient distance to permit theblank to pass thereunder and thus prevent more than one blank passingout of the chute and traveling with the slide, the ejector thus servinga double purpose.

1n Figs. 13, 14 and 15 is illustrated a form of hood to inclose the saw,collect the chips, and prevent oil from iiying around the room andmachine. This hood is designated 110 and has a lateral arm 111 by whichthe hood is secured to the head 21, and an opening 112 near its bottom'end through which the chips and oil escape therefrom.y Threaded intothe top of this hood is a pipe 113 by which oil is conducted from aconvenient source of supply and dropped` onto the saw While rotating.All of the gears and pinions on our machine can be shifted or new onesof differing diameters substituted so as to provide for varying'relative speeds of rotation.

There are minor changes and alterations that can be made within ourinvention, aside from those herein suggested, and we would thereforehave it understood that we do not limit ourselves to the exactconstruction herein shown and described, but claim all that falls fairlywithin the spirit and scope of our invention.

Ilaving described our invention, what we claim as new and desire tosecure by Letters Patent, is:-

1 In a machine of the character described, the combination with avertically adjustable stationary block having an angular contact face;of a horizontally movable block; a rock sleeve; an operative connectionbetween said movable block and rock sleeve; a rotary shaft; and a camactuated connection between said rotary shaft and rock sleeve.

2. In a machine of the character described, the combination with anadjustable stationary block having an angular contact face; of a movableblock; a rock sleeve; an eccentric' shaft for said rock sleeve; aconnection between said movable block and rock sleeve; and means for imarting movement to said rock sleeve at prei. eterinined periods.

3. In a machine of the character described,

the combination with an adjustable stationary block having an angularcontact face; of a movable block; a rock sleeve; an eccentric shaft forsaid rock sleeve; means for adjusting the relative position of saideccentric shaft and said rock sleeve; a connection between said movableblock and rock sleeve; and means for actuating said rock sleeve, wherebymotion is imparted to said movable block.

4. In a machine of the character described, the combination with theblank slotting means; of a reciprocating slide; a knife attached to saidslide; and means for actuating said slide to move the knife across thehead of a screw and thereby automatically remove the bur therefromwithout shaving the head.

5. In a machine of the character described, the vcombination with theblank holding means having a reci rocable part; of a chute arranged soas to deliver blanks onto said reciprocable part; and means adjacent tosaid reciprocable art and arranged to engage the head of said lank foradjusting the position thereof on said reciprocable part during thefirst portion of the movement thereof and leaving the head thereofuncovered during the latter portion of said movement.

6. In a machine of the character described, the combination with blankholding means, comprising a stationary block and a movable block; of afeed chute arranged so as to deliver blanks onto said movable block; andmeans for adjusting the osition of said blanks on said movable b ockbefore the same completes'its forward movement, said means comprising afixed alinement plate which projects toward said stationary block an dterminates a short distance therefrom.

v7 In a machine of the character described, the combination with theblank holding means; of a slot cutting mechanism; a reciprocating burremoving knife; means for positively actuating said knife in onedirection; and spring meansfor moving the same in the oppositedirection.

8. In a machine of the character described the combination with theblank holding means and means for cutting slots in one enc of saidblank; of a reciprocating bur removing knife; a rotary cam; and anintermediate lever between said knife and cam for actuating said knife.

9. 'In a machine of the character described, the combination with blankholding means; of means for presenting a blank to said holding means;mechanism for cutting a slot in one end of said blank and pointing theother end of the same blank at one and the same time; and aAreciprocating knife passing across the slotted end o f said blank forremoving the bur after said slotting operation and while said blank isheld by said holding means.

10. In a machine of the character described, the' combination with blankholding means; of saw means for slotting said blank; and a reciprocatingcutter movable in the path and at substantially right angles to the axisof said blanks for removing the bur from said blanks formed by theslotting operation.

11. In a machine of the character described, the combination with ablank holding means, comprising a fixed block, a movable block having acrosswise depression in its upper surface near the frontend thereof ofsubstantially the same depth as the diameter of the blank, and a slottherein at substantially a right angle to the aforesaid recess; meansfor reciprocating said movable block a feed chute for delivering blanksinto the recess in said movable block; an ejector mechanism, comprisinga plate lying between said feed chute and stationary block; and meansfor actuating the same, whereby said plate will be held above saidmovable block a sufficient distance to permit a single blank to passthereunder when said block is in its retracted position and dropped intothe slot in said movable block after said blocks have gripped the blank.

12. In a machine of the character described, the combination withnon-rotatable blank holding means, said means comprising a stationarypart and a movable part; and a swinging cam actuated ejector platebrought into the path of said movable part after the blank has beensecured by said holding means, held stationary while said movable partis being withdrawn, and moved out of line therewith before anotherforward movement is imparted to said movable part.

13. In a machine of the character described, the combination with blankholding means having a reciprocating art; of a chute located so as todeliver b anks onto said reciprocating part when in one of itspositions; and a stripper' plate arranged adjacent to said chute and inone position held a suflicient distance above the reciprocating part topermit a single blank to pass thereunder and escape from said chute andin its other position move down'back of the blank so that the same isstripped therefrom as the reciprocating part is being returned to itsoriginal position.

y141. In a machine of the character described, the combination with thestationary block 16; of the movable block 22 having a depression in thetop surface thereof near the front end, the wall 24 forming one edge ofsaid recess; a slot 74 in said movable block at right angles to theaforesaid recess and of substantially the same depth; a feed chute fordelivering blanks onto said movable block; and an ejector plate 69 lyingbe tween said stationary block and feed chute and actuated so thatduring a portion of the reciprocation of said movable block the bottomof said late will be above the bottom of said movab e block and will liewithin said slot 7 4 during another portion of its movement.

15. In a machine of the character described, the combination with blankholding means; of the slotting means and mechanism for pointing the endof the same blank during the slotting operation, said printing meanscomprising a rotary shaft, a pointing shaft with its axis substantiallycoincident with the axis of the blank while being slotted, a gearedconnection between said shafts, a pointing knife in the end of saidointing shaft, means for adjusting the endwise 1position of said shaftin relation to said ho ding means; and cam means for imparting anendwise movement to said shaft during the rotation thereof.

16. In a machine of the character described, the combination with blankholding endwise position of said shaft in relation tol said blankholding means, a rock shaft having connection with said shaft, and cammeans for actuating said rock shaft, whereby said pointing shaft isreciprocated.

17. In a machine of the character described, the combination with meansfor holding the screw blank; of means for slotting the blank at one endand pointing the same at the other end, both of said operations beingerformed at one andthe same time.

18. n a machine of the character described, tlie combination with meansfor holding the screw blank, said means being shorter than said blank;of means for slotting the blank at one end and pointing the same at theother end, both of said operations being performed at one and the sametime.

In testimony whereof we aflixour signatures in presence of twowitnesses.

DAVID C. GRIGGS. ROY H. SMITH.

